Phase change cold storage cabinet for central air conditioner terminal

Abstract

The invention relates to the field of phase change cold storage cabinets, and discloses a phase change cold storage cabinet for the tail end of a central air conditioner, which comprises a fan coil, and the fan coil is provided with a liquid inlet pipe and a liquid outlet pipe; a box body is arranged on the fan coil, a liquid inlet box is mounted on one side in the box body, a liquid discharge box is mounted on the other side in the box body, the liquid inlet box is communicated with a liquid inlet pipe through a communicating pipe, and the liquid discharge box is communicated with a liquid discharge pipe through an auxiliary communicating pipe and a circulating pump; a phase change material is arranged in the box body, the liquid inlet box and the liquid outlet box are communicated through a plurality of exchange pipes so as to achieve flowing of liquid and heat exchange, and a plurality of turbulent flow cleaning mechanisms are arranged in the exchange pipes. Through the turbulent flow cleaning mechanism and the magnetic component, the movable part moves in the pipe length direction under the magnetic action during water passing, the inner wall is scraped, the water flow direction is changed, and the heat exchange efficiency and the water temperature uniformity are improved. Meanwhile, the magnetic field enhances the activity of calcium and magnesium ions in water and reduces incrustation adhesion, the moving part moves back to clean the inner wall again when water is cut off, and the heat exchange effect is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of phase-change cold storage cabinets, and more specifically, to a phase-change cold storage cabinet for a central air-conditioning terminal. Background Art

[0002] Central air conditioning systems are widely used in large buildings. They are favored for their efficient operation and centralized control. However, they face problems of low efficiency and insufficient adjustment flexibility during light load and overtime hours. Property management often adopts a simple strategy, that is, turning off central air conditioning during non-working hours, which may make the office environment uncomfortable during overtime. Although employees can request to turn on the air conditioner during overtime, they have to bear high costs. In addition, due to the small load, the efficiency of the refrigeration host decreases, and the power is seriously wasted, which violates the concept of energy saving and environmental protection. With the advancement of technology, people began to combine cold storage devices with central air conditioning terminals. By connecting the supply and return water pipes of fan coil units, the storage device is charged with cold during working hours, and the relevant valves are closed during non-cold storage periods. During overtime, the cold storage device and the fan coil units form a circulating water system to provide cold water for the fan coil units at the central air conditioning terminal, thereby solving the cooling needs during overtime hours.

[0003] When the cold storage device is operating to store cold, cold water from the central air-conditioning system will be introduced. The cold water will undergo temperature changes due to the interaction with the phase change material inside the cold storage device. When the cold storage device is not in use, the water inside it will remain static for a long time. This long period of static state will easily lead to scale accumulation in the heat exchange pipe. The formation of scale will hinder the normal progress of subsequent heat exchange, thereby weakening the subsequent heat exchange efficiency. Summary of the invention

[0004] The present invention provides a phase-change cold storage cabinet for a central air conditioner terminal, which solves the technical problem in the related art that scaling occurs in the exchange tube of the phase-change cold storage cabinet for a central air conditioner terminal and reduces the subsequent heat exchange.

[0005] The present invention provides a phase-change cold storage cabinet for a central air conditioner terminal, comprising a fan coil unit, wherein the fan coil unit has a liquid inlet pipe and a liquid outlet pipe; The fan coil unit is provided with a box, a liquid inlet box is installed on one side of the box, and a liquid discharge box is installed on the other side. The liquid inlet box is connected to the liquid inlet pipe through a connecting pipe, and the liquid discharge box is connected to the liquid discharge pipe through an auxiliary connecting pipe and a circulating pump; Phase change material is provided inside the box, and the liquid inlet box and the liquid discharge box are connected through a plurality of exchange tubes to realize the flow of liquid and heat exchange, and a plurality of groups of turbulent flow cleaning mechanisms are provided inside the exchange tubes; The disturbance and cleaning mechanism includes a magnetic fixed part and a magnetic movable part that generate a magnetic field and act on the water flowing through the water body. The magnetic movable part has a first position state and a second position state. In the first position state, the magnetic movable part changes the distance from the magnetic fixed part and performs disturbance. In the second position state, the magnetic movable part moves toward the magnetic fixed part and cleans the exchange tube.

[0006] As a further optimization scheme of the present invention, the magnetic fixed part includes a mounting ring, a fixed magnetic ring 1 and a fixed magnetic ring 2. The mounting ring is fixedly sleeved inside the exchange tube. The fixed magnetic ring 1 and the fixed magnetic ring 2 are respectively installed on both sides of the mounting ring. A connecting opening is formed in the middle of the mounting ring, the fixed magnetic ring 1 and the fixed magnetic ring 2, and the diameter of the opening gradually increases from the fixed magnetic ring 1 toward the fixed magnetic ring 2.

[0007] As a further optimization solution of the present invention, a connecting ring is installed on a side of the fixed magnetic ring away from the mounting ring, and the interior of the connecting ring is rotatably connected to the axial flow fan blades through a rotating ring.

[0008] As a further optimization scheme of the present invention, the magnetic moving part includes a moving block, a moving magnetic ring 1, a moving magnetic ring 2 and a blocking block. The moving block is slidably sleeved inside the exchange tube and is provided with an inclined flow guide channel. The moving magnetic ring 1 and the moving magnetic ring 2 are respectively embedded on both sides of the moving block. The magnetic properties of the moving magnetic ring 1 and the fixed magnetic ring 1 are the same, and the magnetic properties of the moving magnetic ring 2 and the fixed magnetic ring 2 are opposite. The blocking block is installed on one side of the moving block, one side of the blocking block is adapted to the through opening, and the other side is in a round block shape.

[0009] As a further optimization solution of the present invention, a slip ring is fixedly mounted on the outer periphery of the blocking block, and a fluid flow channel opposite to the direction of the guide flow channel is obliquely opened on the slip ring.

[0010] As a further optimization solution of the present invention, a scraper ring is installed on one side of the moving magnetic ring, the inner hole diameter of the scraper ring is the same as the outer diameter of the connecting ring, and the width of the scraper ring is the same as that of the connecting ring.

[0011] As a further optimization solution of the present invention, the interior of the box body is divided by partition plates between adjacent exchange tubes.

[0012] As a further optimization solution of the present invention, a valve 1 is provided on the liquid inlet pipe, a valve 2 is provided on the liquid discharge pipe, and solenoid valves are provided on the auxiliary pipe and the connecting pipe.

[0013] As a further optimization solution of the present invention, the outside of the box is wrapped with a thermal insulation layer.

[0014] As a further optimization solution of the present invention, a temperature sensor is provided inside the box.

[0015] The beneficial effects of the present invention are: 1. The phase-change cold storage cabinet for the terminal of a central air conditioner described in the present invention, during the heat exchange process, by setting a turbulence cleaning mechanism, when liquid water is continuously passed into the exchange tube, the flow of the liquid water will interact with the magnetism of the magnetic fixed part and the magnetic movable part. This magnetic effect will change the distance between the magnetic fixed part and the magnetic movable part, so that the magnetic fixed part moves along the length direction of the exchange tube. During this process, the magnetic movable part will scrape the inner wall of the exchange tube and change the flow direction of the liquid at the same time, thereby increasing the uniformity of the liquid water temperature. This design can not only effectively clean the inner wall of the exchange tube, but also increase the disturbance of the liquid, thereby significantly improving the heat exchange efficiency.

[0016] 2. The phase-change cold storage cabinet for the terminal of a central air conditioner described in the present invention cooperates with a magnetic fixed part and a magnetic moving part. Under the action of the generated magnetic field, the activity of calcium and magnesium ions in the water is enhanced, and they are easily combined with carbonate to form tiny crystals to avoid adhesion to the pipe wall. At the same time, the magnetic field changes the crystal form of calcium carbonate into loose aragonite, which is easily washed away by water flow. Magnetized water increases the solubility of ions and reduces scale. In addition, the magnetic field acts through static electricity and Lorentz force, so that when the liquid water is stationary or heat exchanged, the adsorption of ions on the inner wall of the pipe is reduced to prevent scale formation.

[0017] 3. The phase-change cold storage cabinet for the terminal of a central air conditioner described in the present invention has a magnetic moving part that moves back to the initial position when the circulation of liquid water in the exchange tube is stopped. During the return process, the inner wall of the liquid exchange tube is cleaned again. At the same time, the adhesion of scale is reduced with the effect of magnetism, which is beneficial to the heat exchange effect when it is used again. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an overall diagram of a phase-change cold storage cabinet for a central air-conditioning terminal proposed by the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of a phase-change cold storage cabinet for a central air-conditioning terminal proposed by the present invention.

[0020] Figure 3 This is a schematic cross-sectional structure diagram of a box body used in a phase-change cold storage cabinet at the terminal of a central air conditioner proposed by the present invention.

[0021] Figure 4 This is a schematic diagram of the internal structure of an exchange tube in a phase-change cold storage cabinet at the terminal of a central air conditioner proposed by the present invention.

[0022] Figure 5 for Figure 4 Schematic diagram of some structures in .

[0023] Figure 6This is a schematic diagram of the split structure of a turbulence cleaning mechanism for a terminal phase-change cold storage cabinet of a central air conditioner proposed by the present invention.

[0024] Figure 7 This is a structural schematic diagram of a central air-conditioning terminal phase change cold storage cabinet proposed by the present invention, in which a central magnetic moving part moves to another set of magnetic fixed parts when the cabinet is in use.

[0025] Figure 8 for Figure 7 Schematic diagram of some structures in .

[0026] In the figure: 1. Fan coil unit; 101. Liquid inlet pipe; 102. Liquid discharge pipe; 2. Box body; 3. Liquid inlet box; 4. Drain box; 5. Connecting pipe; 6. Auxiliary pipe; 7. Circulation pump; 8. Exchange tube; 9. Turbine cleaning mechanism; 91, magnetic fixed part; 911, mounting ring; 912, fixed magnetic ring 1; 913, fixed magnetic ring 2; 914, connecting ring; 915, rotating ring; 916, axial flow fan blade; 92, magnetic moving part; 921, moving block; 9211, flow guide channel; 922, moving magnetic ring 1; 923, moving magnetic ring 2; 924, blocking block; 925, slip ring; 9251, fluid flow channel; 926, scraper ring; 10. Separator; 11. Valve 1; 12. Valve 2; 13. Solenoid valve. DETAILED DESCRIPTION

[0027] The subject matter described herein will now be discussed with reference to example implementations. It should be understood that the discussion of these implementations is only to enable those skilled in the art to better understand and implement the subject matter described herein, and the functions and arrangements of the elements discussed may be changed without departing from the scope of protection of the contents of this specification. Various examples may omit, replace, or add various processes or components as needed. In addition, the features described in some examples may also be combined in other examples.

[0028] like Figures 1 to 4 As shown, a phase-change cold storage cabinet for a central air conditioner terminal according to an embodiment of the present invention includes a fan coil unit 1, and the fan coil unit 1 has a liquid inlet pipe 101 and a liquid discharge pipe 102; The fan coil unit 1 is provided with a box body 2, a liquid inlet box 3 is installed on one side of the box body 2, and a liquid discharge box 4 is installed on the other side. The liquid inlet box 3 is connected to the liquid inlet pipe 101 through a connecting pipe 5, and the liquid discharge box 4 is connected to the liquid discharge pipe 102 through an auxiliary connecting pipe 6 and a circulating pump 7. The interior of the box 2 is provided with a phase change material (this phase change material is a phase change material that can be converted between liquid and solid, which is a known technology and will not be described in detail here). The liquid inlet box 3 and the liquid discharge box 4 are connected through a plurality of exchange tubes 8 to achieve liquid flow and heat exchange. The exchange tube 8 is a copper tube, and the discharge outlet of the exchange tube 8 is smaller than its inner diameter. The interior of the exchange tube 8 is provided with a plurality of groups of turbulent cleaning mechanisms 9; The turbulence cleaning mechanism 9 includes a magnetic fixed part 91 and a magnetic movable part 92 which generate a magnetic field and act on the water flowing through the water body. The magnetic movable part 92 has a first position state and a second position state. In the first position state, the magnetic movable part 92 changes the distance from the magnetic fixed part 91 and performs turbulence. In the second position state, the magnetic movable part 92 moves toward the magnetic fixed part 91 and cleans the exchange tube 8.

[0029] It should be noted that the liquid inlet pipe 101 of the fan coil unit 1 is used to input liquid (its liquid inlet end is connected to the water supply pipeline of the central air conditioner), the liquid discharge pipe 102 is used to discharge liquid, and the liquid discharge end of the liquid discharge pipe 102 is connected to the return pipeline of the central air conditioner, the liquid discharge box 4 is connected to the liquid discharge pipe 102 through the auxiliary pipe 6 and the circulation pump 7. When the circulation pump 7 is started, the liquid in the liquid discharge box 4 can be pumped into the liquid discharge pipe 102. The phase change material in the box body 2 is used to store cold energy. The liquid inlet box 3 and the liquid discharge box 4 are connected through a plurality of exchange tubes 8. The liquid flows in the exchange tubes 8 and exchanges heat with the phase change material. The turbulence cleaning mechanism 9 in the exchange tube 8 has a magnetic fixed part 91 and a magnetic movable part 92 that generate a magnetic field. When the magnetic movable part 92 is in a first position, the magnetic movable part 92 and the magnetic fixed part 91 change their relative positions due to the effects of magnetism and liquid, and can scrape the inner wall of the exchange tube 8. At this time, the magnetic field acts on the water flowing through, and the magnetic movable part 92 disturbs the flow, thereby increasing the contact effect between the water and the inner wall of the exchange tube 8. When the magnetic movable part 92 is in a second position, the magnetic movable part 92 moves toward the magnetic fixed part 91 to clean the inner wall of the exchange tube 8, reduce the adhesion of impurities such as scale, and ensure the heat exchange effect.

[0030] Reference Figures 4 to 6 Content, the magnetic fixed part 91 includes a mounting ring 911, a fixed magnetic ring 1 912 and a fixed magnetic ring 2 913, the mounting ring 911 is fixedly mounted inside the exchange tube 8, the fixed magnetic ring 1 912 and the fixed magnetic ring 2 913 are respectively mounted on both sides of the mounting ring 911, and a connecting opening is formed in the middle of the mounting ring 911, the fixed magnetic ring 1 912 and the fixed magnetic ring 2 913, and the diameter of the opening gradually increases from the fixed magnetic ring 1 912 toward the fixed magnetic ring 2 913.

[0031] It should be noted that the influence of magnetic field on scale formation is: Changing the state of ions: Under the action of the magnetic field, the hydration radius of scale-forming ions such as calcium and magnesium in the water becomes smaller, and the ion activity is enhanced. These ions are more likely to combine with carbonate ions to form tiny calcium carbonate or magnesium carbonate crystals instead of adhering to the inner wall of the pipe.

[0032] Changing the crystal form: The magnetic field can change the crystal form of calcium carbonate from dense calcite to loose, soluble aragonite. This crystal structure is not easy to adhere to the inner wall of the pipe and is more easily washed away by water.

[0033] Increase solubility: Magnetized water treatment can increase the solubility of water, increase the solubility of calcium and magnesium ions in water, and thus reduce the formation of scale.

[0034] Effect of magnetic field on scale adhesion: Electrostatic effect: The inner wall of the pipe usually carries a negative charge, which will absorb positively charged calcium and magnesium ions, thus forming scale. The magnetic field can reduce the electrostatic adsorption of ions and the inner wall of the pipe by changing the charge distribution of ions or increasing the activity of water molecules.

[0035] Lorentz force: The Lorentz force in the magnetic field can change the movement trajectory of scale ions, making it more difficult for them to adhere to the inner wall of the pipe.

[0036] Furthermore, a connecting ring 914 is installed on the side of the fixed magnetic ring 912 away from the mounting ring 911 , and the interior of the connecting ring 914 is rotatably connected to an axial flow fan blade 916 via a rotating ring 915 .

[0037] It should be noted that when liquid water enters the exchange tube 8 from the liquid inlet box 3, it acts on the axial flow blades 916, and the axial flow blades 916 rotate to turbulently mix the liquid water, increase the uniformity of temperature, and thus facilitate heat exchange.

[0038] Reference Figures 4 to 8 Content, the magnetic moving part 92 includes a moving block 921, a moving magnetic ring 1 922, a moving magnetic ring 2 923 and a blocking block 924, the moving block 921 is slidably sleeved inside the exchange tube 8, and is provided with an inclined guide channel 9211, the moving magnetic ring 1 922 and the moving magnetic ring 2 923 are respectively embedded on both sides of the moving block 921, the moving magnetic ring 1 922 has the same magnetic properties as the fixed magnetic ring 1 912, and the moving magnetic ring 2 923 has opposite magnetic properties to the fixed magnetic ring 2 913, and the blocking block 924 is installed on one side of the moving block 921, one side of the blocking block 924 is adapted to the through port, after the phase change material is completed to store cold, the blocking block 924 extends into the through port, and the other side is round; an annular channel is formed between the round block side and the inner wall of the exchange tube 8, so that the liquid flows close to the inner wall of the exchange tube 8, thereby increasing the uniformity of heat exchange and temperature.

[0039] Furthermore, a slip ring 925 is fixedly mounted on the outer periphery of the blocking block 924. When the slip ring 925 moves along the length direction of the exchange tube 8, it can scrape the inner wall of the exchange tube 8. A fluid flow channel 9251 is obliquely opened on the slip ring 925 in the opposite direction of the guide flow channel 9211.

[0040] It should be noted that, by providing the flow guide channel 9211, the magnetic moving part 92 in one set of the flow disturbance cleaning mechanism 9 is moved to the magnetic fixed part 91 of the other set of the flow disturbance cleaning mechanism 9 by the action of the water flow and the magnetic force (refer to Figure 8 At this time, the liquid water passes through the guide channel 9211 and acts on the axial flow blades 916 to cause turbulence.

[0041] A scraper ring 926 is installed on the side of the moving magnetic ring 922. The inner diameter of the scraper ring 926 is the same as the outer diameter of the connecting ring 914, and the width of the scraper ring 926 is the same as that of the connecting ring 914. Figure 8 In this state, the scraper ring 926 is sleeved on the outer periphery of the connecting ring 914 , and the scraper ring 926 scrapes the inner wall of the exchange tube 8 while limiting the moving range of the blocking block 924 .

[0042] Reference Figure 2 and Figure 3 The interior of the box body 2 is divided by partition plates 10 between adjacent exchange tubes 8 .

[0043] It should be noted that the partition plates 10 between adjacent exchange tubes 8 in the housing 2 can separate the phase change materials in different exchange tubes 8 to avoid mutual interference, making the flow of liquid in each exchange tube 8 more stable and improving the efficiency and uniformity of heat exchange.

[0044] Reference Figures 1 to 3 Content, a valve 11 is provided on the liquid inlet pipe 101, a valve 2 12 is provided on the liquid discharge pipe 102, and a solenoid valve 13 is provided on the auxiliary pipe 6 and the connecting pipe 5.

[0045] It should be noted that when the phase change material is storing cold, the solenoid valve 13 is in an open state, so that liquid water is diverted through the liquid inlet pipe 101 into the interior of the liquid inlet box 3 and finally flows into the liquid discharge pipe 102 through the auxiliary pipe 6 for discharge.

[0046] The outside of the box 2 is wrapped with an insulation layer (not shown in the figure). The insulation layer wrapped around the outside of the box 2 can reduce the heat exchange between the phase change material in the box 2 and the external environment, reduce the loss of cold energy, and improve the cold storage efficiency, so that the cold storage cabinet can store cold energy more effectively and provide a stable cold source for subsequent use.

[0047] A temperature sensor (not shown) is provided inside the box 2. The temperature sensor inside the box 2 is used to monitor the temperature of the phase change material in the box 2 in real time. The state of the phase change material can be determined through the temperature data fed back by the temperature sensor.

[0048] Working principle: In the cold storage stage of the phase change material, valve 11, valve 2 12 and solenoid valve 13 are opened, and part of the liquid water enters the fan coil 1 through the liquid inlet pipe 101, and part of the liquid water is diverted through the connecting pipe 5 and flows into the liquid inlet box 3. The liquid inlet box 3 diverts the liquid water and exchanges heat with the phase change material in the exchange tube 8. The liquid water enters the interior of the exchange tube 8. Since the blocking block 924 is inserted into the interior of the through hole in the initial state, the blocking block 924 is continuously pushed away from the magnetic fixed part 91 on the water-facing side by the flow of liquid water and the magnetic force, and continuously flows toward the flow direction. The magnetic fixed part 91 on one side moves, and the liquid water passes through the annular area formed by the blocking block 924 and the exchange tube 8, so that the liquid water area is distributed in the annular area to increase the heat exchange effect. The liquid water passes through the guide flow channel 9211 toward the axial flow fan blade 916 to play a turbulent role and increase the uniformity of the liquid water temperature. When the temperature value of the phase change material is the preset value, the valve 11 and the valve 2 12 are closed. At this time, since there is no continuous liquid supply inside the exchange tube 8, the fixed magnetic ring 1 912 on one side of the blocking block 924 acts on the moving magnetic ring 1 922 to move back (refer to Figure 8 ), the fixed magnetic ring 2 913 (the fixed magnetic ring 2 913 here refers to: the fixed magnetic ring 2 913 at another set of magnetic fixed parts 91 on the water-facing side of the blocking block 924) on the other side of the blocking block 924 attracts the moving magnetic ring 1 922, and at this time, the sliding ring 925 and the moving block 921 can be driven to scrape the inner wall of the exchange tube 8 when moving back, so as to play a role of cleaning, which is conducive to reuse.

[0049] When cooling the fan coil 1 only by the phase change material, the valve 1 11 and the valve 2 12 are closed, and the circulation pump 7 and the solenoid valve 13 are started. The circulation pump 7 extracts the liquid water inside the drain box 4 through the auxiliary pipe 6, and sends the liquid water into the drain pipe 102 and enters the fan coil 1. The liquid water flows out from the inlet pipe 101, passes through the connecting pipe 5 and enters the interior of the inlet box 3, then enters the exchange tube 8 to exchange heat with the phase change material, and is discharged from the drain box 4, and enters the fan coil 1 again for circulation, so as to play the role of cooling.

[0050] The above describes an embodiment of the present invention, but this embodiment is not limited to the above specific implementation methods. The above specific implementation methods are merely illustrative and not restrictive. Under the guidance of this embodiment, ordinary technicians in this field can also make many forms, all of which are protected by this embodiment.

Claims

1. A phase-change cold storage cabinet for a central air conditioner terminal, comprising a fan coil unit (1), characterized in that: The fan coil unit (1) comprises a liquid inlet pipe (101) and a liquid outlet pipe (102); The fan coil unit (1) is provided with a box (2), a liquid inlet box (3) is installed on one side of the box (2), and a liquid discharge box (4) is installed on the other side, the liquid inlet box (3) is connected to the liquid inlet pipe (101) through a connecting pipe (5), and the liquid discharge box (4) is connected to the liquid discharge pipe (102) through an auxiliary connecting pipe (6) and a circulating pump (7); Phase change material is provided inside the box (2); the liquid inlet box (3) and the liquid discharge box (4) are connected via a plurality of exchange tubes (8) to achieve liquid flow and heat exchange; a plurality of groups of turbulent cleaning mechanisms (9) are provided inside the exchange tubes (8); The flow disturbance and cleaning mechanism (9) comprises a magnetic fixed part (91) and a magnetic movable part (92) which generate a magnetic field and act on a water body flowing through the water body, wherein the magnetic movable part (92) has a first position state and a second position state. In the first position state, the magnetic movable part (92) changes the distance from the magnetic fixed part (91) and performs flow disturbance. In the second position state, the magnetic movable part (92) moves toward the magnetic fixed part (91) and cleans the exchange tube (8).

2. According to claim 1, a phase change cold storage cabinet for central air conditioning terminal, characterized in that: The magnetic fixed part (91) comprises a mounting ring (911), a fixed magnetic ring 1 (912) and a fixed magnetic ring 2 (913); the mounting ring (911) is fixedly sleeved inside the exchange tube (8); the fixed magnetic ring 1 (912) and the fixed magnetic ring 2 (913) are respectively mounted on both sides of the mounting ring (911); a connecting opening is formed in the middle of the mounting ring (911), the fixed magnetic ring 1 (912) and the fixed magnetic ring 2 (913); and the diameter of the opening gradually increases from the fixed magnetic ring 1 (912) toward the fixed magnetic ring 2 (913).

3. According to claim 2, a phase change cold storage cabinet for central air conditioning terminal, characterized in that: A connecting ring (914) is installed on one side of the fixed magnetic ring 1 (912) away from the mounting ring (911), and the interior of the connecting ring (914) is rotatably connected to an axial flow fan blade (916) via a rotating ring (915).

4. The phase-change cold storage cabinet for central air-conditioning terminal according to claim 3 is characterized in that: The magnetic moving part (92) comprises a moving block (921), a moving magnetic ring 1 (922), a moving magnetic ring 2 (923) and a blocking block (924); the moving block (921) is slidably sleeved inside the exchange tube (8) and is provided with an inclined flow guide channel (9211); the moving magnetic ring 1 (922) and the moving magnetic ring 2 (923) are respectively embedded on both sides of the moving block (921); the moving magnetic ring 1 (922) has the same magnetic properties as the fixed magnetic ring 1 (912); the moving magnetic ring 2 (923) has the opposite magnetic properties to the fixed magnetic ring 2 (913); the blocking block (924) is installed on one side of the moving block (921); one side of the blocking block (924) is adapted to the through opening, and the other side is in a round block shape.

5. A phase-change cold storage cabinet for a central air conditioner terminal according to claim 4, characterized in that: A slip ring (925) is fixedly sleeved on the outer circumference of the blocking block (924), and a fluid flow channel (9251) is obliquely opened on the slip ring (925) in the opposite direction to the guide flow channel (9211).

6. The phase-change cold storage cabinet for central air-conditioning terminal according to claim 5, characterized in that: A scraper ring (926) is installed on the side of the moving magnetic ring (922); the inner hole diameter of the scraper ring (926) is the same as the outer diameter of the connecting ring (914); and the width of the scraper ring (926) is the same as that of the connecting ring (914).

7. The phase-change cold storage cabinet for central air-conditioning terminal according to claim 6, characterized in that: The interior of the box (2) is separated by a partition plate (10) between adjacent exchange tubes (8).

8. The phase-change cold storage cabinet for central air-conditioning terminal according to claim 7, characterized in that: The liquid inlet pipe (101) is provided with a valve 1 (11), the liquid discharge pipe (102) is provided with a valve 2 (12), and the auxiliary pipe (6) and the connecting pipe (5) are both provided with a solenoid valve (13).

9. A phase-change cold storage cabinet for a central air conditioner terminal according to claim 8, characterized in that: The outside of the box body (2) is wrapped with a thermal insulation layer.

10. A phase-change cold storage cabinet for a central air conditioner terminal according to claim 9, characterized in that: A temperature sensor is provided inside the box (2).

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